Title:
APPARATUS COMPRISING ENCAPSULATED THERMOACOUSTIC PROJECTOR BASED ON FREE-STANDING NANOTUBE FILM
Document Type and Number:
WIPO Patent Application WO/2014/152438
Kind Code:
A3
Abstract:
A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, y=Cp/C v, and low heat capacity, Cp). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.
Inventors:
ALIEV ALI E (US)
BAUGHMAN RAY H (US)
BAUGHMAN RAY H (US)
Application Number:
PCT/US2014/027341
Publication Date:
January 08, 2015
Filing Date:
March 14, 2014
Export Citation:
Assignee:
UNIV TEXAS (US)
International Classes:
H04R23/00
Foreign References:
| US8019097B2 | 2011-09-13 | |||
| US20100166232A1 | 2010-07-01 | |||
| US20100046784A1 | 2010-02-25 | |||
| US20100054504A1 | 2010-03-04 |
Other References:
H. D. ARNOLD; 1. B. CRANDALL: "The thermophone as a precision source of sound", PHYS. REV., vol. 10, 1917, pages 22 - 38, XP002728747
LIN XIAO ET AL: "Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers", NANO LETTERS, AMERICAN CHEMICAL SOCIETY, US, vol. 8, no. 12, 29 October 2008 (2008-10-29), pages 4539 - 4545, XP002534917, ISSN: 1530-6984, [retrieved on 20081029], DOI: 10.1021/NL802750Z
LIN XIAO ET AL: "Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers", NANO LETTERS, AMERICAN CHEMICAL SOCIETY, US, vol. 8, no. 12, 29 October 2008 (2008-10-29), pages 4539 - 4545, XP002534917, ISSN: 1530-6984, [retrieved on 20081029], DOI: 10.1021/NL802750Z
Attorney, Agent or Firm:
GARSSON, Ross, Spencer et al. (LLP77 West Wacker Drive, Suite 310, Chicago IL, US)
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